第四章研究了在网格存储系统中底层网络构建上，多区域对等网络的数据分发机制。
Chapter Four studies the data distribution mechanism among multi-region Peer to Peer network which is the underlying of Grid Storage system.
郑纬民(1946 -)：男，教授，博士生导师，研究方向为网格计算、集群计算、高性能存储系统和生物信息学。
Zheng Weimin (1946 -) : Professor, Ph. D. supervisor. Research interest: grid and cluster computing, high performance storage system and biology computing.
网格数据库服务规范定义了用网格数据服务(GDS)来访问和集成存储在多种存储系统的数据，这些数据库包括关系数据库、XML数据库和文件系统。
The GDSS defines grid data service (GDS) standard for accessing and integrating data stored in multiple types database including relational databases, XML databases, and file system.
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